Improvement in sewing-machines



TpBuRRQ Sewing Machine. Y

' l Patented' April 9, 1861.

UNITED STATES PATENT rtree.

THEODORE BURR, OF BATTLE GREEK, MICHIGAN, ASSIGNOR TO HIMSELF, AUGUSTUS ROWER, AND PARCEL BRINKERHOFF.

lMPROi/.EM ENT INSEWING-NIACHINES.

Specification forming part of LettersPateut No. 32,023, dated April 1861.

To all whom 'it may concern.-

Be it known that I, Dr. THEODORE BURR, of Battle Greek, in the county of Calhoun and State of Michigan, have :invented a new and useful Machine for Vorking Button-Holes; and I do declarethat-the following is' a full, clear, and exact description ofthe construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure l is a perspective View. Fig. 2 is the cam in its open form. Fig. 3 is the horizontal forksbaft, provided with a spiral twist near the center, and also a fork,` (marked 60,) showing its relative position with the fork shaft K, and having a slot, so as to allow the movement of the spiral twist `between its prongs. lts opposite end is so constructed as to form a. joint and be attached to the levert in Fig. l, the shaft K being provided with a fork with two prongsat the end of the shaft, and each prong (marked b b) being provided with a fork (marked d d) turned at right angles with the prongsl b b, the opposite end of shaft K being pointed, for the purpose of rotating in the foot 0i' lever H in Fig. 1. Fig. 4 is a perpendicular shaft, having a groove cut iu its lower endA sufficiently deep to receive the point of the spring marked o, Fig. l, and the pivoted fork-shaped hook marked p P. Two feathers or beads (marked R R) are also fixed upon the shaft marked E, where it playsin the bearings, for the purpose of keeping it in its position, and for the purpose, also, of being operated upon by the cog or spur F, which, by

means ot' a screw, is adjustable upon the needle-shaft marked D in Fig. 1, Fig. 5 is a perspective view of the feeding-lever marked e and springy, showing their relative position to the needle-shaft D in Fig. l and f in Fig. 5. For the purpose of feeding, a set-screw, (marked g,) which is set in the needle-shaftf, operates upon the upper end ofthe lever marked c, attached to a fulcrum, m, at its center, and having a forked feeding-foot so constructed as to allow the movements between its prongs .of

,the hook-fork P, Fig. 4, the needle and the spring-foot X to hold the cloth.

This invention consists of a metallic frame so arranged as to admit a line-shaft with tw'o cranks-the first marked A, by which the machine is set in motion, the second (marked B) In line with the needle-shaft D is placed a second perpendicular shaft or rod, (marked E,)

as described in Fig. 4, it being so arrangedA that while the cog or spur F is passing in the space between the. two feathers or guides the hookshaft E is held to its position by the spring 0, whose lower and bears against the shaft with sufficient force for that purpose, until the cog or spur F comes in contact with the feather R R, and carries it either up or down sufficiently far for securing the loop on the book-fork P while below, and bringingthe same above the cloth through the button-hole. During the ascent of the shaft E this hook P is, by means of the point of the spring o, thrown outward and immediately under the needle,`

and held by the spring o in the proper position for the needle to pass through the slot in the hook-fork P, and thus secure the loop. A cani (marked G) is fixed on the lineshaft marked S, which 'operates upon two levers, H and t, which pass up through the frame in a vertical position, and crossing each other at or near the center, at which vpoint the levers H and 'i' are attached to the frame by means of a pin, (marked 10,) so as to allow a movement by the action of the cam between the levers at their upper ends, the lever H being lirst operated upou by the action ot' the cam, so as to press forward the horizontal shaft K, which is placed in the slot in the center of the stand vmarked W, and secured by means of two boxes, so as to allow a horizontal rotating movement of the shaft K, thus, in pressing the shaft for'- ward with the prongs b b, laying the one perpendicular over the other in the proper position for the two forks d d on the points ot' b bA to catch thethread from the needle and carry it in line with the hook-fork t, which is down at this point ot' the operation, and then `the pressure nrbeing stayed until the operation of the cam G upon the lever t', being attached to the fork L in Fig. l, which draws upon the spiral part of the horizontal shaft K and rolls the upperprong b, with its fork d, over the hook-fork t, so that the raising of the hook-v fork t by the action of the cog on spur F catches the loop from the forks d d, and, bringing it up through the button-hole, is then, by

x means of the point of the spring o, thrown outward and immediately under the needle, and held by the springe until the needle passes through the slot in the hook-fork t and secures the loop thus formed. Then, by means of coiled springs T and u upon the horizontal shaft K and tbe action of the cam Gr `upon the lever H, the shaft is thrown back to its former position.

What I claim as my invention, and desire to secure-by Letters Patent, is-

1. The combination of the cam G, the levers H and z', operating upon the horizontal shaft K, having forked prongs d d and bb and spiral twist, and the fork a, as described, and for the purpose set forth.

2. The cog or spur F, in combination with the shaft E, provided with feathers li R and hook-fork P, opera-ted upon by springr o, substantially :is `and for the purpose set forth.

fruEoDoRE BURR.

Attest z "J oHN MUCHUN,

LEVI MORHER. 

